Tube Sock:A sock that is knit in the shape of a tube, having no knit-in heel pocket.

Made of 91% Polypropylene, 9% Spandex

Polypropylene/Olefin:A superior, water-repelling fiber that won't accept moisture. It is used alone or with absorbent outer layers that work together to wick moisture away from your body. It is very strong and has the lowest specific gravity (lightest) of any man-made fiber. It is also stain-resistant and colorfast. The company that developed this fiber won the Nobel Prize.

Spandex:A man-made fiber with elastic properties that is often used in place of rubber. Used with other fibers, it provides elasticity, recovery, and close fit, primarily in the legs of socks to hold them in place and in the arch and ankle to provide extra support.